Test 7 #1,2

Test 7 #3,4

Test 7 #5,6

Test 7 #7,8

Test 7 #9

Test 7 #10

Test 7 #11

Test 7 #12,14

Test 5 #10

Test 3 #3

Test 2 #14

Test 2 #1-7

ArcTan spits out four possible angles

Test 2 #6,7

Test 2 #12

Test 3 #10

Test 4 #6

Test 4 #7

Swimming the river